Author: tylerl2015

Everyday Acids Lab

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Purpose: Find the pH of candy chosen.

Materials:

6.90g of A.S.A

100 mL Water

Mortar and Pestle

50.0 mL of NaOH

Phenolphthalein

Funnel

Burrette

Graduated Cylinder

200 mL Beaker

75 mL Beaker (x3)

 

Procedure:

  1. Weigh out mass of candy (acid).
  2. Grind candy with mortar and pestle.
  3. Combine 100 mL of water with grinded candy.
  4. Filter the mixture.                                        
  5. Drop NaOH into 10 mL of the mixture until color changes (Do 3 trials).

 

Calculations:

Conclusion:

We found that A.S.A has a pH value of 2.5. According to the internet, the average pH of A.S.A (Aspirin) is 1-3.

Finding keq

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CJ Artates, Tyler Lange, Xavier Cornelius

Part I:  Preparation of a standard absorption curve for FeSCN+2

Standard 0.20M Fe(NO3)3 0.0020 M KSCN 0.100M HNO3 [FeSCN+2] Absorbance
A

 

 10.0 mL 0.0 mL 15.0 mL  0.0 M  0.00
B

 

 10.0 mL 1.0 mL 14.0 mL  8.0 x 10^-5  0.39
C

 

 10.0 mL 1.5 mL 13.5 mL  1.2 x 10^-4  0.50
D

 

 10.0 mL 2.0 mL 13.0 mL  1.6 x 10^-4  0.56
E

 

 10.0 mL 2.5 mL 12.5 mL  2.0 x 10^-4  0.79
F

 

 10.0 mL 3.0 mL 12.0 mL  2.4 x 10^-4  1.03

EQUATION:       y = 4017.9x + 0.0093                                                              R2 = 0.974

Part 2: Measuring Equilibrium

Test Solution 0.0020 M Fe(NO3)3 0.0020 M

KSCN

 0.10 M

HNO3

 Initial [Fe+3] Initial [SCN–] Absorbance Equilibrium

[FeSCN+2]*
I

 

 5.0 mL 0 5.0 mL  0.001  0  0.00
II

 

 5.0 mL 1.0 mL 4.0 mL  0.001  0.0002  0.16  3.6 x 10^-5
III

 

 5.0 mL 2.0 mL 3.0 mL  0.001  0.0004  0.34  8.2 x 10^-5
IV

 

 5.0 mL 3.0 mL 2.0 mL  0.001  0.0006  0.52  1.3 x 10^-4
V

 

 5.0 mL 4.0 mL 1.0 mL  0.001  0.0008  0.91  2.2 x 10^-4
VI

 

 5.0 mL 5.0 mL 0.0 mL  0.001  0.001  1.04  2.6 x 10^-4

 

* To be determined from the standard graph equation.

ANALYSIS:

Use your graph equation to calculate the equilibrium concentrations of FeSCN+2.

  1.  Prepare and ICE chart for each test solution (II – VI) and calculate the value of Keq for each of your 5 tests solutions.

ICE CHARTS

Test Solution

Keq = 2.30 x 10^2

 Fe3+               +                SCN–                    ⇄            FeSCN2+
I

 

 0.001  0.0002  0
C

 

  – 3.6 x 10^-5  – 3.6 x 10^-5  + 3.6 x 10^-5
E

 

  9.64 x 10^-4  1.64 x 10^-4  3.64 x 10^-5

 

Test Solution

Keq = 2.81 x 10^2

 Fe3+               +                SCN–                    ⇄            FeSCN2+
I

 

 0.001  0.0004  0
C

 

  -8.2 x 10^-5  -8.2 x 10^-5  + 8.2 x 10^-5
E

 

  9.18 x 10^-4  3.18 x 10^-4  8.2 x 10^-5

 

Test Solution

Keq = 3.18 x 10^2

 Fe3+               +                SCN–                    ⇄            FeSCN2+
I

 

 0.001  0.0006  0
C

 

  -1.3 x 10^-4  -1.3 x 10^-4  +1.3 x 10^-4
E

 

  8.70 x 10^-4  4.70 x 10^-4  1.3 x 10^-4

 

Test Solution

Keq = 4.86 x 10^2

 Fe3+               +                SCN–                    ⇄            FeSCN2+
I

 

 0.001  0.0008  0
C

 

  -2.2 x 10^-4  -2.2 x 10^-4 + 2.2 x 10^-4
E

 

  7.80 x 10^-4  5.80 x 10^-4  2.2 x 10^-4

 

Test Solution

Keq = 4.75 x 10^2

 Fe3+               +                SCN–                    ⇄            FeSCN2+
I

 

 0.001  0.001  0
C

 

  -2.6 x 10^-4  -2.6 x 10^-4 + 2.6 x 10^-4
E

 

  7.40 x 10^-4  7.40 x 10^-4  2.6 x 10^-4

Comment on your Keq values.   Do your results convince you that Keq is a constant value regardless of the initial concentrations of the reactants?  Why or why not? CONCLUSION AND EVALUATION:

Keq is constant. Our average value recorded from our data wasn’t very far off from the reported value of Keq. If we had done the lab more precisely, our Keq values for each solution would be the same. We had some possible cross contamination with each solution that might’ve affected our average Keq.

  1. Calculate the average value of Keq from your five trials. The actual value of Keq  for this reaction at 25oC is reported as 280.   Calculate (should you use all of your values?) the percent difference of your average value from the reported value:

% difference = (experimental value – reported value) x 100%

(358 – 280)/280 x 100% = 28% Error

Reported value

English 12 poem project

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Link to article

“Nike’s cult of devoted followers has cemented its position as one of the world’s foremost megabrands, one whose products cause riots ”

Obsession

Obsession embodies
Into my soul,
and settles down to the ambition that flows through my locks to my sole.
What is obsession
It is as a addicting as nicotine,
It is a love for something that you need in your life,
It is a inescapable prison in your mind.

Gandalf quote paragraph

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In Gandalfs quote it states that change can be made by small acts that you may not think would do much, like in South African storm the girl in the story walks in the storm with the African Americans who are being segregated and she thinks that the man offering her a ride and not any of the African Americans isn’t right, she thinks that’s if she gets in the cab that the African Americans will be mad at her for it. Although small act alike this won’t completely stop racism any thing no matter how small can contribute to stopping it. Allison is aware of the racism that is going on in South Africa but she does not agree with it at all and she rather befriend with the African Americans then segregate them like the rest of the country, which is also a small act that can make a tiny difference to the cause.

Blog log 2 – Why facts don’t change our minds

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Why facts don’t change our minds by James clear
Link to article

In this article he writes about how people may ignore facts if these facts are against what they believe no matter how notable the source that the facts are coming from. This articles title caught my attention because of how true it is and made me think about times I have ignored someone stating facts because of my own morale beliefs and it interested me after thinking about all the times I have gone with what I think and not with the facts, James clear uses an analogy in this story that Humans are like herds of animals, People want to fit in with the crowd and earn respect from others and to earn that respect from a group people can ignore facts and go with the what that group of people believe to help earn the respect from that group. He make stage point that “In many circumstances, social connection is actually more helpful to your daily life than understanding the truth of a particular fact or idea.”

Blog Log #1

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Link To article

The Ingenious Methods Nike Uses to Control the Sneaker Resell Market
By Alec Leach

This article talks about how nike and Jordan run 96% of the shoe reselling business alone, it describes how Shoe reselling has its own market that anyone can get into and start reselling and Nike helps out the reselling market By ensuring that the quantity of the supply that they put out never fully meets the demand of that shoe which creates a market for reselling that makes the reselling business millions of dollars a year .The title of this article caught my attention because I have bought Nike shoes for resale and I have sold Nike shoes for resale prices, and I find it very interesting how Nike makes low quantities of these shoes to boost the reselling business. The authors style of writing gives us many types of views into the reselling market from the mind of a reseller and in the mind of how nike helps with the reselling community and resellers, the author compares being a reseller to being “in the trade of illegal drugs” in the way that “Supply is limited and controlled by one agent” and there are no requirements to get into it all you need is your products and your buyers, much like the trade in illegal drugs there are no set prices for the shoes it all depends on the rarity and the demand of the shoes.

Physics Newtons laws video project

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Second ball Newton’s first law
Newtons first law plays a role on the soccer ball, when kicked it keeps on going forward until friction, a person, or another object like a wall stops it. When a soccer ball is resting on the ground it will stay like that until someone kicks it or another force acts upon it.

Tug of war Newton’s third law
A tension force is directed along the rope as the rope is being stretched by the 2 people pulling on it in opposite directions. This force is evenly distributed along the length of the rope

Pool Newton’s second law
Newton’s second law applies to shots in a billiards for one thing, most players accelerate through their stroke. Since acceleration is proportional to force, the greater the acceleration the larger the force that the player can apply on the ball